Questions tagged [gears]

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51 views

Why is the spin velocity of a gear irrelevant if perfectly balanced?

Going through some theory about epicyclic gears I came accross a comment that says that the spin velocity of the gear irrelevant if perfectly balanced, I don't understand why this might be true, is it ...
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3answers
173 views

What's the difference of using different state-space forms for solving eigenvalue problem?

I have a set of equations of motion describing a planetary gear train of 18 DoF (sun, 3 planets, carrier and ring), they have the general form of: $$\mathbf{M{\ddot q}+{\Omega_c}G{\dot q}+{Kq}=F(t)}$$...
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2answers
104 views

Criteria for gear design

Updated with comments/answers from community to make more complete I'm trying to understand why gears are designed in some specific way instead of another. So far my understanding is that: energy is ...
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2answers
126 views

Vertical gear shaft support

I have a question regarding how are the vertical forces on a spur gear shaft are supported. I am currently doing my undergraduate (in final year) and have only dealt with gearboxes where the shafts ...
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2answers
265 views

Engage and disengage DC motor from free-spinning reel

So i want to have a reel (~4cm diameter) that will pull a ~80cm string with a torque of ~8kg-cm (edit: thanks for the clarification). To pull I want to use a gear motor. E.g. 12V DC motor like this: ...
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1answer
584 views

Calculating force transferred from pinion gear to rack

I am really challenged as I need to fit a bunch of motors in a 6" box acting as linear actuators. I was looking for linear actuators (most I found were brushed DC) at first but the ones I found that ...
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1answer
759 views

How does gear reduction affect a stepper motor's holding torque?

I'm new to mechanical engineering, gears, and motors. Coming from a software/hardware background, I am trying to understand how to leverage gear reduction to maximize the torque output of a stepper ...
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1answer
133 views

Time duration for a mechanical wind up mechanism?

Is there a specific way to figure out the gear ratio I would need for a wind up mechanism that could last around one year? Would I start out with a really high tooth and step down too a small enough ...
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1answer
1k views

How to design a gear escapement like in an old pendulum clock?

I've already got a gear that has its teets as in the picture: I want to create the mechanism from the picture, but it's harder than I expected. I think my gear is not the problem. But I'm not able to ...
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3answers
418 views

Building a wah-wah pedal

I want to prototype a wah-wah guitar pedal using an arduino, a potentiometer, and some meccano I have lying around. I thought of two ways to do this : the first one is to put a pinion on the pot, and ...
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2answers
3k views

Gear Locking Mechanism

I would like to control the locking of a gear, using a solenoid. My original idea was to simply activate the solenoid to pull back the lock (a tooth that sticks into the gear), but that means that I'...
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3answers
73 views

What generates more friction? Spur gears or a timing belt?

In my project a knob (usually rotated by hand) can be turned also by a stepper motor. On the other hand, when the motor is not energized, the knob can be rotated manually as normally. To transmit the ...
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1answer
31 views

Increasing rotation via simple gears

Complete amateur here with a product idea and a need to find out whether it can work in theory. I need to push a lever vertically down through 90 degrees and have a lateral arm swing horizontally ...
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1answer
136 views

Internal Geneva drive calulations/design

So there is a lot of information out there about designing an external Geneva drive, but I can't seem to find anything about designing an internal one. I'm trying to design something similar to this (...
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2answers
2k views

What is meant by "shock load" in gears?

What is meant by shock load in gears? What are steady, light, medium and heavy shock loads?
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3answers
995 views

Tug of war robot w/ max torque [closed]

Hey I was wondering what kind of chassis, wheels, gears are for a robot with a lot of torque. Please help. I have decided on a trapezoidal chassis, and I know that the servo connects to the small gear ...
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1answer
1k views

Is there a way rotate a wheel in a single direction but have opposing motions every 180 degrees?

In order to give you a good idea of what I want to accomplish suppose you have a telescope mounted on a single rod extruding from the ground. The telescope is free to move such that you can tilt it to ...
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2answers
90 views

Velocity or Speed Ratios in Gears and Gear Trains

I have seen the different definitions of the velocity ratio for Gears and Gear trains. I have referred a book called Theory of machines by S. S. Ratan. In that book the definitions are as following: ...
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1answer
95 views

How does the diameter of a worm gear affect the amount of force needed to turn it

Can anyone help inform a discussion I'm having with fellow modellers on a model railway forum? I have a locomotive powered by an electric motor turning a 20mm diameter worm gear meshing with a spur ...
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3answers
44 views

static friction of gear pair

Im working on a project that has gearing system integrated. From my simulation results im dealing with a relatively small amount of input force at the gearbox and would like to know if the force would ...
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1answer
26 views

Delivering RPM from a fixed wheel to a moving wheel

I have spent the past few days thinking about a good way to get power/RPM from a fixed wheel delivered to a wheel that is able to move in a 2D plane relative to the fixed wheel. I am not too good at ...
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3answers
115 views

Key fitting - Shafts and Gears

I am designing a gearbox and wanted to know whether the key on the shaft and gear must fit exactly with the bore in the gear and keyway in the shaft. Ex. If there is a key that is 3x3 mm, and does the ...
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2answers
87 views

Optimal gear combination with the same ratio

Summary: In a gear train, with given target ratio and configuration (eg. number of gears and how many compound gear steps are involved), what are the considerations when trying to select the optimal ...
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2answers
57 views

Calculating and Designing a Ring Gear for LEGO

I'm working on 3d printing a planetary gear for LEGO. I've got a constrained set of planetary + sun gears and was looking into designing a custom ring gear. I've read a little bit into the design of ...
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1answer
31 views

Inertia and friction between gears

I have a question regarding inertia and friction between gears. I have a gear which is connected to the rod at one end and an electric motor which is connected to the other end. I know the torque of ...
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2answers
370 views

Calculating the torque required to move and hold an arm parallel to the floor

I'm a computer scientist doing a dissertation in robotics and I'm designing a mechanical arm that mirrors a humans, as such I am wanting to pivot the entire arm from a "shoulder" using a stepper motor ...
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3answers
111 views

How to accumulate torque of multiple independent gears?

I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps: As an example, let's assume we have multiple windmills, each of them producing torque, but ...
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3answers
124 views

Is there a cheap way to get gears

Is there generally any cheaper way to get a bunch of gear wheels. I've been to some local companies who specialize in gear production and the price is always somewhere in the range 100-150 USD for a ...
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1answer
421 views

Gear pump has backflow and does not stop forced flow

I have a "Micropump GB-P25.JVS.A" gear pump. I pump in the range between 100 and 500 ml/min up to a column about 10 cm above the pump level. The column is filled from the top and has a bottom outlet. ...
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1answer
242 views

The name of this cross-sectional shape

What is the cross-sectional shape in blue called? The shape, used on the shafts, is used for torque transfer, gears or similar. The three arcs are same diameter as the ball bearing ID, so bearings ...
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1answer
237 views

How can I couple two small parallel shafts offset a short distance from each other?

I have two parallel shafts, 3 millimetres in diameter and offset by 8 millimetres, both anchored in surrounding housing by ball bearings. When one shaft is rotated (via gear), I want the other shaft ...
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1answer
259 views

Epicyclic Gear Train [closed]

I'm working on a solution to this problem and I would like some advice and help. A fixed-ring epicyclic gear train is required to have an overall ratio of 5.5:1. If the sun gear is to have between ...
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1answer
221 views

How split-flap display rotates by exact angle

In a split-flap display there is a barrel which rotates by a small angle N times to get to some next display element. However I fail to understand, how it is possible that the barrel rotates exactly ...
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1answer
77 views

Larger gear for telescope focus rack?

I am not a mechanical engineer, so just trying to figure this out. I want to attach a servo to my telescope focus, but the servo only has about 180 degrees motion, whereas you need to turn the knob ...
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1answer
1k views

Gears - dynamic factor $K_v$

I am trying to understand what the dynamic factor $K_v$ describes. I know that a low $K_v$ factor results in quieter and smoother work of the gear but what exactly does $K_v$ tell me?
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3answers
80 views

Do gears affect top speed?

Do more gears affect the top speed/acceleration of the car in any way? I know the gears won't increase hp since more gears would increase RPM but would decrease torque.
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1answer
55 views

Best DIY material for a high-torque cog or gear?

I am making a gear/cog to attach to a high torque stepper motor. I can realistically make it out of the following variety of materials: 3D printer PLA/PLA+ etc. layered PLA/PLA+ and fiberglass made ...
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2answers
56 views

What joint can I use for two thin parallel shafts to transmit both rotational and and linear power (in the axis of the shaft)?

I am here regarding a personal project but I am not a mech engineer. The shaft is a watch stem that is displaced from the crown stem. The two shafts are positioned like in the photo below but are 0....
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1answer
55 views

Geometric constraints on Planetary Gears

I would like to design a single stage planetary gearbox using standard gears. There appears to be three primary conditions to ensure the geometry of the gears will fit - correct center distance, ...
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2answers
417 views

Gear train using two inputs and one output. Understanding six link epicyclic gear topology - Interpreting displacement graphs

I'm interested in printing a working two degree of freedom planetary gear set. I searched around and found a paper from University of Maryland in 1988 (source). I am having difficulty translating the ...
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1answer
145 views

Is there a way to auto-reverse cassette tape with gears only?

From what I read, tape decks auto-reverse by having a sensor keep track of an encoder. When the take up pulley stops turning, the logic board reverses the direction of the motor (and does some other ...
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1answer
206 views

If a driver gear has larger radius than a driven gear, will a larger gear ratio result in more torque supplied to the driven gear?

Suppose a driver gear has larger radius than a driven gear. For example, we have a pinion with a main disk, where the main disk is larger than the pinion and the pinion is a follower. This is the case ...
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1answer
153 views

Driving Gearbox in Reverse

https://www.maxongroup.com/maxon/view/product/251601 https://www.maxongroup.com/maxon/view/product/gear/spur/gs45/301171 Consider that this motor-gearbox combination is backdriven so that the motor ...
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1answer
497 views

Motor, a gearbox and a drum with a cable lifting a mass

A lifting device consists of an electric motor, a gearbox and a drum with a cable for lifting a mass. The speed after the initial acceleration is $v=0.5\,\text{m/s}$. The gear efficiency $\eta=0.7$ ...
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1answer
64 views

Electric engine and transmission

What kind of automatic transmission would be the best to connect an electric engine with the rear axle of a RWD car? Specifications: 200HP, 3000rpm electric motor top speed 220km/h The automatic ...
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1answer
123 views

Bevel gear design & usage

The problem : I need to create a mechanism with 2 parallel shafts, at some distance apart, rotating in the same direction, either clock- or anticlock-wise. The distance (> 1m) makes it impractical to ...
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3answers
201 views

How to design a coaxial 1:2 gear without reversing direction?

I am trying to design a gear that has a 1:2 speed ratio (input:output). This design is very limited in space and for simplicity and space savings requires the input and output shafts to be coaxial. ...
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3answers
292 views

How to increase maximum rotational speed limit of a reduction gearbox?

Reduction gearboxes made of machine steel gear have a maximum limit to prevent changing their physical properties (softening). They change their properties as a result of the temperature increase ...
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1answer
64 views

Intuitive understanding of the common normal at the point of contact of 2 gear teeth

Consider 2 oddly shaped surfaces and pick a point on each of the surfaces. At the point considered we can always draw a normal to the surface. Now if the two surfaces are in contact at this same point ...
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1answer
330 views

Are 3d printed gears (ABS) suitable for long term use?

i want to print a worm gear for a robot. This robot will work every day for at least 10 hours. The gears size is about the half of a sheet paper. I searched the internet for example in industrial use....

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